Retrieve back names of header file constants

flags.py

#!/usr/bin/env python2
# -*- coding: utf-8 -*-
#
# Retrieve back names of header file constants
#
# $ ./flags.py PROT 5
# PROT_EXEC           0x4
# PROT_NONE           0x0
# PROT_READ           0x1
# PROT_WRITE          0x2
# 5 or 0x5 is PROT_READ|PROT_EXEC

import argparse

import pwnlib
import z3

parser = argparse.ArgumentParser()
parser.add_argument('type', choices=['AF', 'MAP', 'PROT', 'MSG', 'O', 'PR', 'PTRACE', 'SIG', 'SIGEV', 'SOCK', 'SYS'])
parser.add_argument('value', type=int)
parser.add_argument('--os', default='linux')
parser.add_argument('--arch', default='amd64')
args = parser.parse_args()

with pwnlib.context.context.local(os=args.os, arch=args.arch):
    consts = [getattr(pwnlib.constants, item) for item in dir(pwnlib.constants) if item.startswith(args.type + '_')]
    for const in sorted(consts, key=int):
        print '%-20s%s' % (const, hex(int(const)))

z3vars = [z3.Bool(str(const)) for const in consts]

solver = z3.Solver()
solver.add(args.value == z3.Sum([z3var * int(const) for z3var, const in zip(z3vars, consts)]))

if solver.check() == z3.sat:
    model = solver.model()
    print '%d or %s is %s' % (args.value, hex(args.value), '|'.join(str(z3var) for z3var in model if model[z3var]))